zelri property

I had a contract for a year and before i left i sent email to Nelly not renew my contract and i even phoned her when she said she received.On the last day i was leaving the place i phone the guy who was suppose to check if everything if fine ,his name Oageng .Ever since that i moved out i was getting messages that im owing the rent n i would phone them and this other lady told me that will inveatigate n then they stopped.i thought it was fixed but i just got an sms that they have blacklisted me for an amount of R7 000.i need some answers ,i still have the email i sent to cancel my contract.